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Description of Business and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
USF contributions and other regulatory costs, before reversal		$ 7,700
Reversal of accrued federal fees	$ 0	(3,114)	$ 0
USF contributions and other regulatory costs	$ 8,600	$ 4,600	$ 6,200

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- Definition

Cost of Revenue, Universal Service Fund Contributions and Other Regulatory Costs

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- Definition

Cost of Revenue, Universal Service Fund Contributions and Other Regulatory Costs, Gross

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- Definition

Increase (Decrease) of Accrued Federal Fees

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